|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||High Performance Steels
||Carbide Precipitation Strengthening Behaviour in an Additively Manufactured High-speed Steel with Unprecedented Strength
||Huayue Zhang, Hui Peng, Hongbo Guo, Stuart Robertson, Paul A.J Bagot, Michael Moody, Bo Chen
|On-Site Speaker (Planned)
The carbide precipitation behaviours and resultant hardening in additively manufactured high-speed steel (HSS) were investigated with a focus on elucidating the microstructure evolution from as-built to post-processed conditions. The excellent mechanical properties with a combination of high hardness and bending strength were obtained by synergistic effects of small grains and nanoscale precipitates. The quantitive descriptions of primary carbides were characterised by SEM and FIB. The volume fraction and size distribution of nanoscale carbides were investigated by SANS. The elemental information of nano-carbides was characterised by APT. It was found that V-enriched carbides (<10 nm) precipitated at dendritic cores and Cr-enriched carbides (~40 nm) precipitated at interdendritic regions due to the heterogeneous distribution of alloying elements. This study provides important insights into the strengthening mechanism in the post-processed HSS. The knowledge gained can guide us in designing future HSS groups and developing heat treatment procedures tailored for the additive manufacturing process.